Along with the main payload, AKATSUKI, five secondary payloads will be launched by an H-IIA Launch Vehicle. Launch opportunities are offered to secondary payloads that are manufactured by private companies and universities to contribute to enhancing education and fostering human resources. They are launched by utilizing the excessive launch capabilities of an H-IIA.

Introduction of the small secondary payloads

- Deployment and extension of the large membrane
- Power generation by the thin film solar cells
- Verifying acceleration by the solar sail
- Acquiring navigation technology by the solar sail
* IKAROS (Interplanetary Kite-craft Accelerated by Radiation of the Sun)

- Competition to contend "whose computer for space use will survive the longest in deep space" among computers developed by universities for in-orbit verification
- Receiving, sending, and decoding technology experiments of faint radio waves from deep space in cooperation with amateur radio communities.
- Space outreach through the above experiments
- Science and engineering mission in deep space (option)

How to load the secondary small payloads

The three satellites, WASEDA-SAT2, KSAT, and Negai*″ will be loaded on the JAXA Picosatellite Deployer (J-POD) to be aboard the launch vehicle.

Separation order of the payloads

The H-IIA F17, which will be launched from Launch Pad 1 of the Yoshinobu Launch Complex, will fly over the Pacific Ocean, then jettison its solid rocket boosters, the payload fairing, and the first stage. After the first-time combustion of the second stage engine is cut off, three small secondary payloads on the J-POD (WASEDA-SAT2, KSAT, and Negai*″) will be separated. After the second cutoff of the second stage engine, the AKATSUKI will be injected into the Venus transfer orbit. The H-IIA will continue its coast flight and separate the IKAROS and UNITEC-1 from the Payload Attach Fitting (PAF900M, the PAF primarily for the main payload, AKATSUKI.)